Restore context in deny() page
Now that we know when the sidebar is doing the access checks we can
safely construct a new context in deny (without having to worry that
it will try to do more access checks that result in deny, which will
call for a new context... etc).
Patch by: Sverre Rabbelier
import os, sys
sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
import pkg_resources
pkg_resources.require('WebOb')